Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d0f16c7db3cf0a…

MALICIOUS

PDF

43.7 KB Created: 2020-08-05 12:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0b72839d949707d1e0a625b8fbb3c37 SHA-1: c6a996c22c817b7521b3ddc68f5199d98ea3ace7 SHA-256: 53d0f16c7db3cf0a7580165b557a4dd92e41864de91616970b9c90e63ba5b729
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text fragments and URLs that suggest a lure related to medical study PDFs, likely to trick users into clicking the malicious link. The presence of a malicious redirector indicates an attempt to lead the user to a site that likely hosts further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=upper+limb+bd+chaurasia+pdf
    • http://files.bjstewartconcrete.com/uploads/1/3/0/7/130738714/jilev_xukokewofewo.pdf
    • http://files.bigbluerock.org/uploads/1/3/2/6/132696598/9d175a53.pdf
    • http://files.hotdoghols.co.uk/uploads/1/3/1/6/131637043/707450.pdf
    • https://cdn.shopify.com/s/files/1/0432/7555/0876/files/wogapijejalovovutowev.pdf
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/mobijozanapurukefuzoto.pdf
    • https://cdn.shopify.com/s/files/1/0428/6667/1782/files/buzalaxevunologudidel.pdf
    • https://cdn.shopify.com/s/files/1/0433/7077/4693/files/98756154455.pdf
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/branded_2012_film.pdf
    • https://cdn.shopify.com/s/files/1/0428/8125/3535/files/30535477699.pdf
    • https://cdn.shopify.com/s/files/1/0434/0698/3318/files/d_d_races_and_classes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6396/files/gegegonalesidiwitig.pdf
    • https://cdn.shopify.com/s/files/1/0429/1395/6006/files/7664943819.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6582/files/pdf_learn_python_the_hard_way.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006389.bin
8be20ce03738b3331af136d402f99e99defff924e1c687d29b5f99f6127e48b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6389 5524 bytes
font_01_sfnt_off0000761d.bin
edcc4eacd63f56e02c991b237cd673999454ea78a883d82b8d756a200ac03f64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x761D 13724 bytes

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